Dorothea Lange was an American documentary photographer. She studied photography at Columbia University in New York City under Clarence H. White. She decided in 1918 to travel around the world, selling her photographs to earn money. She made it to San Francisco before her money ran out, but settled there and worked in a photography studio.
Lange photographed unemployed men wandering the streets of San Francisco during the Great Depression. These pictures greatly influenced later documentary and journalistic photography.
One of her most well known photographs is Migrant Mother.